58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
|
/*
|
||
|
|
* I/O remap functions for Hexagon
|
||
|
|
*
|
||
|
|
* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 and
|
||
|
|
* only version 2 as published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
||
|
|
* 02110-1301, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/vmalloc.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
|
||
|
|
void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
|
||
|
|
{
|
||
|
|
unsigned long last_addr, addr;
|
||
|
|
unsigned long offset = phys_addr & ~PAGE_MASK;
|
||
|
|
struct vm_struct *area;
|
||
|
|
|
||
|
|
pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
|
||
|
|
|(__HEXAGON_C_DEV << 6));
|
||
|
|
|
||
|
|
last_addr = phys_addr + size - 1;
|
||
|
|
|
||
|
|
/* Wrapping not allowed */
|
||
|
|
if (!size || (last_addr < phys_addr))
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
/* Rounds up to next page size, including whole-page offset */
|
||
|
|
size = PAGE_ALIGN(offset + size);
|
||
|
|
|
||
|
|
area = get_vm_area(size, VM_IOREMAP);
|
||
|
|
addr = (unsigned long)area->addr;
|
||
|
|
|
||
|
|
if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
|
||
|
|
vunmap((void *)addr);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return (void __iomem *) (offset + addr);
|
||
|
|
}
|
||
|
|
|
||
|
|
void __iounmap(const volatile void __iomem *addr)
|
||
|
|
{
|
||
|
|
vunmap((void *) ((unsigned long) addr & PAGE_MASK));
|
||
|
|
}
|